The plotline begins in one of the colonies of humanity â€“ Sedra. Military intelligence detachment investigates some strange activity on this planet. Subsequently the detachment, being heavily attacked by radical terrorist organization finds biological weapons there that are able to influence only a human being. It is possible to understand the nature of these weapons only at place where they were created. Therefore soldiers leave to finish a mission under the command of Jameson Lock. For the sake of survival field investors of detachment have to cooperate with one of the local commander Randall Aiken. Still resting on Sedra the detachment finds alien artifact. Meanwhile on the colony orbit the partially functional section of the destroyed Installation 04 arrives. The visual part of Halo: Nightfall is fascinating. The planets are drawn qualitatively and gloomily, the action is also quite impressive and memorable. Join the protagonists in this absorbing thriller-action story!

Halo: Nightfall season 1 episodes list:

Episode #1:
It's Only Just Beginning (air date: 2014-11-11)

When Agent Jameson Locke and his team are caught in a horrific biological terrorist attack on the distant colony world of Sedra, they must turn to an unlikely source to obtain key information on who exactly is responsible for the attack, and what it might mean for the human race.

The ONI troops under Commander Locke along with a detachment from the planet Sedra under Colonel Aiken are headed into danger. In the wake of a biological attack, the team departs Sedra in a Condor dropship for a treacherous battleground: a remnant of the Alpha Halo.

The tension between Agent Locke and Colonel Aiken is mounting, even as they try to retrieve the HAVOK trapped aboard their crashed ship. As the team tries to complete the mission and fight off the new threat, it could spell the end for more than one of the soldiers.

Locke and his ONI squad – along with Colonel Aiken and his Sedran Guard – are still trying to make it to their crashed ship. But the deadly, technology-seeking Hunter worms that inhabit this chunk of Halo ring are whittling the team down.
As more team members fall victim to the Hunter worms, the remaining members face the possibility that not everyone can be rescued, and team alliances begin to form. Tensions rise, and Locke and Aiken have to try and keep their teams together long enough for any of them to survive.